Answers

No they don't!
The reason is simple- patrons at Hooters some times do things they shouldn't. A woman who is adult and treated that way falls under a different part of the law the a young lady who is still clearly a minor. Meaning while a patron might get kicked out for touching an older woman- if the female was 16 it should go to court and the offending party might end up having to register as a sex offender the rest of their lives.
It is not about you being mature enough- it is about the immaturity of some of the customers.